FLOOD FLOW ANALYSIS DURING RISING AND FALLING STAGES IN A DOUBLY MEANDERING COMPOUND CHANNEL
Natural rivers are predominantly meandering. They are usually composed of a deep main channel and adjacent shallow floodplains. When the main meander channel is flanked by floodplains with meandering levee, it results in a doubly meandering compound channel. This paper explores the flood flow characteristics in a doubly meandering compound channel. It is found that the discharge and relative depth relationship is highly non-linear. The maximum difference in discharge between rising and falling stage is found to be at a relative depth of 0.17. The velocity-water depth relationship is also highly non-linear and characterized by familiar clock-wise loop formation. The extent of loop is more pronounced at a relative depth of 0.17. The depth-averaged 2-D velocity distribution shows that at the bend apex section, the velocity takes maximum along the inner bank while the velocity takes minimum along the outer bank for both rising and falling stages. The velocity in the cross-over section takes the maximum along the centerline of the main channel for both rising and falling stages.
flood flow doubly meandering compound channel stage-discharge velocity distribution
Islam G.M.Tarekul Kawahara Yoshihisa Tamai Nobuyuki
Department of Civil and Environmental Engineering, Hiroshima University 1-4-1 Kagamiyama, Higashi Hi Graduate School, Kanazawa Gakuin University, Sue-Machi 10, Kanazawa-Shi, Ishikawa 920-1392,Japan
国际会议
第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)
南京
英文
387-392
2008-10-20（万方平台首次上网日期，不代表论文的发表时间）